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Underground Stormwater Detention and Infiltration 

Our underground systems offer you flexibility and customization for either detention or infiltration applications – metal, concrete, and plastic systems are available.

Belowgrade Detention IconDetention systems are employed on a site to reduce the quantity of stormwater runoff leaving a site by temporarily storing the runoff that exceeds a site’s allowable discharge rate, and releasing it slowly over time.


Underground Infiltration SystemInfiltration systems are incorporated to reduce the volume of stormwater runoff being discharged from a site. This runoff reduction strategy is a major part of a low impact development design.

Detention / Infiltration Systems

CMP Detention and Infiltration System

Corrugated Metal Pipe (CMP)
With its low cost a wide variety of diameters, layout configurations, and materials, CMP is an ideal choice for detention and infiltration.

CMP Detention - University Blvd Dallas TX


Corrugated, open-bottom plastic chambers economically infiltrate runoff and optimize storage on shallow sites.

ChamberMaxx - Indiana Hospital

DuroMaxx SRPE Detention System

Steel-reinforced polyethylene pipe has fewer joints to assemble on site, can be made water tight, and can be used in applications with corrosive soils.

DuroMaxx Detention Puyallup WA

CON/SPAN Concrete Arch Detention System

Modular, precast concrete arch system designed to provide economical, large volume stormwater detention or infiltration below grade

CONSPAN Detention

Terre Arch
Modular, multi-chambered, precast concrete stormwater storage system engineered for underground installation.

 Terre Arch


Flow Control Products

Vortechs Flow Control Valves

Vortex Valves

Control the discharge flow rate from drainage, storage attenuation and infiltration systems

StormGate Flow Control

StormGate Flow Control

Reduce high energy flow of runoff prior
to water quality treatment system

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Resource Links

  Detention and Infiltration Solutions Guide

  Stormwater Product Line Card

  LID Application Guide

Click for details Contech detention/infiltration systems can be easily modeled with the HydroCAD Stormwater Modeling System.
Click here for more details.